HDZero vs Analog on a 65mm Whoop: a Measured 34% Flight-Time Cost

Everyone knows digital video costs flight time on a whoop. Almost nobody publishes the number. Here are two 65mm builds flown on the same day, on the same pack model, on the same props: one analog, one HDZero. The analog build flew 233 seconds. The HDZero build flew 154 seconds. That is a 34% reduction.

The two builds

The measurement

Same pace both flights — slow cruise, not racing, not hovering. Both packs taken from 4.35 V to roughly 3.3 V under load, delivering about 270 mAh of their nominal 300. Current is the honest headline: 4.2 A against 6.3 A, a 50% increase in draw for the same flying.

Why it is not just the weight

The HDZero build is 2.31 g heavier all-up, about 9%. That alone does not explain a 50% current increase. A 9% weight penalty costs roughly 9% more current to hold altitude, not fifty. The rest is the video system drawing power directly — the VTX runs whether you are moving or not, and on a 25-gram aircraft a transmitter that would be a rounding error on a 5-inch is a large fraction of the total budget.

That is the useful takeaway: the cost is mostly fixed, not proportional. It does not scale down if you fly gently, and it does not go away with a lighter frame.

What the numbers do not say

One run each. Not an average of five. Different airframes and different motors, because these are two real aircraft rather than one aircraft with the video system swapped — the clean experiment would fly the same frame twice, and this is not that. Treat 34% as the right order of magnitude for this class, not a constant.

The current figures come from onboard sensors that were well off out of the box: the analog build read about 20% cold, the HDZero build about 25% hot. Both were corrected against a full-discharge anchor, which leaves roughly 8% uncertainty on the current numbers. The durations are stopwatch and carry no such caveat.

Hover and freestyle times are not measured yet, only cruise. Punch-heavy flying will compress both numbers and may not preserve the ratio.

Deciding

If your 65mm sessions are already ending at three minutes, HDZero takes you to roughly two and a half. Whether that is worth a picture that does not break up is a question about how you fly, not one this page can answer. What it can tell you is the size of the trade, measured rather than guessed.

A 450mAh pack recovers some of the time at a weight penalty — the build calculator will estimate that for your own numbers, though note that the measured anchors on this page apply to the 300mAh configuration as flown.

Source data

Raw bench records, including per-flight voltages, sensor correction factors and what remains unmeasured: air65-analog-vci0702-30k.json and mobula6-2024-hdzero-se0702-28k.json. Measured 2026-08-05.